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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd6288c074a775dfc259c29fda9aa906e293f01baa89a1cd18abef0201c895c' 
  AND token = 'rQHuIHbH/9ioZ8tmaPCDgYXztzf7hUP8e0gIL68r9PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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