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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67308f273961d09f9cdab73040b211142dd3356d83becf6ae5d3c09811db7d77' 
  AND token = 'af7dY++yenM9SgrpHzEiugn9EUtEDsoY2AsBkw0Dbqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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