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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80bc6383d988811998ab22fa5104126031ad6a2f9a98742ad69873b3fe9002c9' 
  AND token = '/Q4eTSHEPp3GnVOcjSExIHWomrH6iIDVMnNPJNteEWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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