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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fde76d2897a147ed01573c04b8ddd8fb6073c453bf8af215a7d1bd61062f5ee' 
  AND token = 'pBqLw4nO5WS6bw08upBlJ0f6O0ye26aBleelGvsP2FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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