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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9636009b3b5e3840f75a18a0f65a0ad52e3f02b85419aa8affc60a006f5b34' 
  AND token = 'TbainUt915cj6Hvx0v/0gVtjaue4CZv4szGQJr+ZRHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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