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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c316cf709a7c8d9ab530fe9e61fc496931c6e32728b2def2ecfc863b8438c9' 
  AND token = 'b3O2NTe52WLQRBUfbC6tIVONE9Shhb+J1VMCE1twtbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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