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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76da6a4385b05cf836d8c268bd553e39bf83cec0b7e4c925d88d6738b265cf45' 
  AND token = 'EIAkRMbcubCNa2shMdeKfYf02CDsS/F49lN/NGVYo9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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