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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec67379df7273839fa1eeefa03b1f3e8dadfdf60f02d2dc1c81b7fd7a3c4a53' 
  AND token = 'LTOezppxsoj2qklDgBVuM0eZ90GS6f1rQ1hxAQt09Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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