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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a056c04bf65bfbee8ed89c1ec9d25af04cf23efd7b1e4c6b5444668082d40062' 
  AND token = 'fslfNaZ6JIt+MDYIUIzoIfVUjioWSP4jConYjcn5h50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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