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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dfbe2a96d6259e995f292a1faf075c3cc35d6353e075aaa2576dc4553c5c03' 
  AND token = '3y/lR+qdkEuOfXKhEnr/ekpldvrSpFRkO5JPavnBiUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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