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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf55d4cd5286658675b6a8932e3ed65b0590c5426403f9844a85ca7abf6ac90' 
  AND token = 'UMoG8oru/+CTTUbKmd0EM6N8OTxrA3vUZpyk7XhTrzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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