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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a976c9adbf08c2c13a5f7d33f398345d08c0ea33af927146ccec9e32d9cc3f1e' 
  AND token = 'Pcyy9Kk4UibThvztSjRZM9P0KV8vLQ9SY2ir09ayw5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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