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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89dcd028251b0fa298da331bf2f7987226fdf7ee5b3fdb778a887ac8de45293f' 
  AND token = 'H01Mgy72U+An2qkIJJXYLRcyBJMn6nB9OFvVvYzZBMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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