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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ecace445dc6b318a9fbde2d483c911641299add9b045760db3fc54acec44c2d' 
  AND token = 'qJJr6lw0SGw1vbyiAccupZ6woyIjuEF6kX7xL9WOujQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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