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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c2bdb2f702cb082c239ed64f0bda711eab11eebe91045a7d60f8081fde617a' 
  AND token = 'Z3L22Cl+clLeNkjK26MKiSiBcWgDLhb9bYFmNe0DKy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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