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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d932dc29cc87b649ba1f4795b8b29d3d417d0efee9e9001cb841c97e20a3e4c' 
  AND token = '4Pu7elnRI/lWyrLS9NrUP279v65cXN5nQJtxlhNzdPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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