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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3246a15fabb7fa761b0f7af05cef6e3f498d4f8e56284f0c078f7ae6ca403b4' 
  AND token = 'uKNfI3Wn6F/QcSyRR9EZ1DV8ARdQ+Oxvq8SGMrMXcyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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