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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b52ba8a54c05e800537def61b804e2b1a26471b4434db7dd881eeb8912f1c6c' 
  AND token = 'TEQQxqby5t10HypsZPG8t6xNrhBfu7CFo4INeyPHZSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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