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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29bac7bc8d18e8935d8430052a8e07a8e58049db83e404c7c3c3a98864df562' 
  AND token = 'THoYy8+UGIwo3PdivzNgdBpFD5CJFr3/x6EL6BZIHAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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