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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285426a0d45f1207d45422f20e423184421db108f96d9b88805a2a5d626011f3' 
  AND token = 'PdQhckMGW+swR5TVU1NekqJd/dyoT6QNolXIbGg51cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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