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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a79613fa85dd4198a6121af15729783a68e362ba9362435f39ed4edcd863471' 
  AND token = 'oEZr7cJKUDbIfkN0lSAUmreb1hZ1SPYf8pBjhrUizuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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