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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450dada8edfaa63aed8534cb3e3568193ce5d86bb8ab0701c0f1661ca694c088' 
  AND token = 'b+Z6dpkkamfxc9U5dJIil+ITBfxJzZ/wtxaFW7GF9Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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