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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024bc49c3778499f6e32b60c595ea79d54b745d58935cde102590a520e8ea32d' 
  AND token = '6L7wfJ14hCQyiDwC7TSnWydErgtCPvpHjQJCUlxf2XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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