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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa962f361af72e9afdfcb9bbeda6df1f964ac7cdd466ac4524800d6cd1c48e2a' 
  AND token = 'jQZeh8ArlQnqSms3TtK7cV1b1JJUbFtWmMqaJ2N3JJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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