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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e9933a1be90fe2a3b723ab6d43238fad1a972fc66ad553349e95e41c69f8b70' 
  AND token = 'Bx7VBrSKJaMOgxc3BzgHfcvpIzStYvOb9xGNNLq2PWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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