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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0cc577dd7de8d2328e3ec833c414a8495c74e50fbdbe2bc6a8122c474a76996' 
  AND token = 'VLxBp3AGX20HbDib/HCrvt3Grg0UYJIpYeMAeWP7m+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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