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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f8849ecd3bcf712f3ea58b5e83858696381f5e998f362cc4fdfdf6e25bbbc8' 
  AND token = 'UTTPxUdp70h2eWvNGSlEbNozs7UnR6KbxhH/6b/4CCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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