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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acab04bf4280429ee32b59bbe8778fd4648ac528209036b8b5f698cc9b91961a' 
  AND token = 'UGniM9vj8xcS0Z5edeGQy0zp93Xtp1CEP4RkmFiFhH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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