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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a229a27100629a7e71d9a81700b11f9780d92c70ca3a6beb76c31b43530e0f8' 
  AND token = 'pQbVl+HRGOH+WPmtcGkMT8kLqjOEURVfISrqDnMOSNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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