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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adca2f0aadfba4542471b4acd310a3e9e3ee06c252cb200cd0c4375c943ccdd6' 
  AND token = 'rIUqhkIj/jLdVC6YIQrWTpkY8zYmIpOpXXah1qa67Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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