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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f564e8c23057ac23307d78851c8561a574499c6e520e46a65254973c104b2b4' 
  AND token = 'pg8AQmbpo4ZJ3UxfnFk0lCPE0lnJJfvonLIBhKXmhCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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