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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbd734e022eda1b8983881272d68fb90aa5b2fd157500e690f61a98b66bfa3d' 
  AND token = 'JTmPKqInrm55SrT63o0ofvt50lTfS+bt0OqJjMM2ZRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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