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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8688d7ff820710704e3f897d7bdc1e2a6162e896802bb6fed5b6f988898709b' 
  AND token = '2jAbM2gTy8VJuiNx8IDEnU1ESiADgrIW15h2+vSks9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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