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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ef0746b9c774c5b7f0d4205dba0540df0f60f878a76e1f5a5f2c2964885b8e' 
  AND token = 'd4/vKOhv3pgPFVg/Y4xfGlmvq1t5rC9NgMEFfpvB6ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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