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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b929c584c035fba3b4beb516a0952860853e10cbd0c1b84e8f0702bcb3ee698' 
  AND token = 'ZgmyjTnkW00jiVJMHC1eCli+F0VpvBB6seKSgRfHuE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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