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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf56cb465f49b1f7eb4ad75a8c67c8cfb76eb34f7ac79ab32bfaf14ed6e5d5d0' 
  AND token = '8i0prugpx2bTAqcho2KGFS4VjOyGm+T085iMr1WpMJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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