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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d8b120f635b3abb27d3f2b9f1672e93db285e9840c8ce2eb1ee626d46f67e4' 
  AND token = 'b1NecMdRR8Te16mXCZQoqqvAPGOVfBxLXkRsVGP/yAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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