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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f83e06b4b37c458b20c04cf64526c1545467c977106f8430aca1d8cf829278' 
  AND token = 'x7N2RGZSF/u6h+byCz0vOI5/EAhIfnw2Uc1HB8I1QpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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