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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba52cc697f6429d4fd2727ccb60646d70a22349340c390cf4997845ab6f214c3' 
  AND token = 'IlLb/CvdDvwMROm18ji2e0wD/GU35OMz/Yfk4aY/nzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}