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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503d76256bab265c126adaa8dedbcfb378b5585fd03c9f3f51c62bce6f018b77' 
  AND token = 'T4H1b5x5oTq3gwWwjB8LD8pMT24Plyec2AqymOGLSSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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