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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf3b9f4eb2a8c23b643383c70375bce3dd3abbdc895be463fd675ba083e8d3e' 
  AND token = 'WtiUHtT1TlNz/kHoqXBgQvoPuzMjPj2mqrbhj0651vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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