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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9a16dac51bca09b74ab8734ca9455b760d3b824be3bb6a6f2a5fe3e6a1836f' 
  AND token = 'b47viVomawdsMBQvTcclu5ba7tCt4+XmHyDDDPcyFn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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