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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b406396f3a23a57d5e66357ebc0c462a330a1a55f3703d2140818b39837e94' 
  AND token = 'rpzRnDIY+Oa4pfloT8+6viZCxMcQ4kNQxX+oiDTLZoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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