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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9f44490eebb2cc99f290f196c2620f4b24c96c08dc8c9f8f508e2695f11c8a' 
  AND token = 'jLUdGbpVIsWVm4S2/idCNy/mPBR8YWSJqhB3XgbOdT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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