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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41c7d006e5cfa69b32da856b19e771e803e32a527222b466677be5477661f37' 
  AND token = '/FxTV1E8j5Uk+HllbWXwzT11oqDKLPXUDCoVFdBUW7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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