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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1088fdafadc702f4c08ca288813637378f21b7b9a055018f0e04031785f6f672' 
  AND token = 'n6ibjB3jlDDQIPM93uydHsx/Yty3Y4508A5rv28vz8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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