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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc753c77e1562026973d1d3df28d3ce67d071f466a9f6d8408a86226b1cda1e' 
  AND token = 'aFXWFCWSU2pbT0r8FZk90i2f92IVTNUtNeguFhlRTjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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