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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd383c0e4da3b3f529e49eb976f0b4320c06e325d27f4b3afc642680d9cb28e2b' 
  AND token = 'rfGU98HJhbGSaeP6kRiIWJYHWrebRY3lIYr+ZDQFX08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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