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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa757063a748ebe7fd93e3aab555a8c440bb48a979d43b70220bf0d8e4c4bac' 
  AND token = '3P4b3av7GrijDmpLBjaJSAR8Xwhq67UBoUW+ykcYYgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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