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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f37a2743c2cc32ee33432d28ec44f1bde2f3f9e1da86860754f0ae5a96e1dc3' 
  AND token = 'tcC5RMpBpiGef5G8VjSou0O50fc9FfwE7Q5m6NXW02k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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