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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca4bbc107ab0ae63b28241f6587b393cb12f3c9c7bb69e3af67d0d128dc5b9a' 
  AND token = 'KWuVs+f0s7Ggs2vmcFAMKKWQ00LyA8AlXKZp5UYgKt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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