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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9052702892e503e449c5d93db15aad9aadf31b064dc78dea11fb69101b58973' 
  AND token = 'Y9QkGjlh8aPaYaNq1CFHWGYBDV8dasVxBZonewtbiuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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