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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18384c4a5bd67484cbe8f904d0cd5fe885fc6b02e60592796fe98af4dae1ae7' 
  AND token = 'PN1xDVzaAwnTI+WmiE2Eyvy4XuH00U7akEBImnsJJzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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