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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1312838e668650f2ef831930ad552fe57c6f673ca35ed2a6af2f753aa67ba279' 
  AND token = 'L4uivB/+sIUUZEPAkttwTdd3hrHWFrSNXfrw9eNmwCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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