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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509b770784f7b5a7c586ad49060dc29ae060406ac8335c5ee7f13a27c688604f' 
  AND token = 'iQfdXV7OPpYMUbnfj5GXWHkf3EGaS7B6oo0YofyclUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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