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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e379580eed4fde5c2ec9815509b39101fef76f654c51182b2361b6cf02cece5' 
  AND token = 'ti5+pKl5m0c6XThDO1VjbwOOw4iTuV93gTatq5NfYm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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