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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2323a312f839b2d259d9265057547e89420b711f2d83d708d1d14e6b1e1641' 
  AND token = 'Hgiuo+fyReQutzTdPgGrSIfIH29/Boiw1I0aHeled4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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