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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5232edceb3f8550546c3eba2b17de6882b98bd419eebcf170d533a8cd1e8976' 
  AND token = 'awcTRAaVKe3vFaU09/wdksYub67lsWPrLRvf3jO2cVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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