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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e526c9e738bc36d7d6ec183ecfc81ee65bb58a721af01af8d0600cc3c23c8e' 
  AND token = 'KmKATJ1Lo+myZTqh10V3KRyEJQidBti2ai4/v2jWisc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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