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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d34bb061df3b63e5e7df36cd008c25e1ff55d371f3dd47fad7257b6ffd43a06' 
  AND token = 'PGwh0ooI7uZuYgS5IRguKWea5vJFZOFZs39evKRTl7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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