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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e192890741c5d95ed1986051b1676b93609b5d1cbb3de2fc348d8864b8573e5' 
  AND token = 'lnlHBKydAu/ust5CK0jB6d8vj5QViDcMksGIuwS10+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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